Thanks Hellosailor. Good advice. I got the rating for up to 130w panels from the specs provided by the manufacturer. I'll see about getting a 20amp controller. I'm a bit reluctant to spend too much on this controller as I intend to get a better one on my next trip to Canada. In the mean time, I have to find something available here or order from abroad, doubling the price when the taxes are applied in Brazil
The place my current controller is mounted is very secure and dry so I'm not too worried about corrosion.